2185691004 has 36 divisors (see below), whose sum is σ = 6314219184. Its totient is φ = 624483072.

The previous prime is 2185690993. The next prime is 2185691059. The reversal of 2185691004 is 4001965812.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2185691004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4336437 + ... + 4336940.

Almost surely, 2^2185691004 is an apocalyptic number.

It is an amenable number.

2185691004 is an abundant number, since it is smaller than the sum of its proper divisors (4128528180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2185691004 is a wasteful number, since it uses less digits than its factorization.

2185691004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8673394 (or 8673389 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2185691004 is about 46751.3743541300. The cubic root of 2185691004 is about 1297.7655905467.

The spelling of 2185691004 in words is "two billion, one hundred eighty-five million, six hundred ninety-one thousand, four".